Thanks, Mark. It has definitely surprised me how much progress I've made. This wiring is insane though, it is without a doubt what has taken the longest so far.
Raising4daughters, thank you for your kind words. It took me quite some time to come up with this design. For a while my design was two simple loops with an inner yard. I'd move stuff around, but couldn't get away from the loops. I beat my own stubbornness and changed the inner loop from O54 to O42 and I was able to change things up.
RTR, thank you. Hopefully I'll be able to run them soon! You're right and she must have figured out what it was because I walked away for a minute came back to her cleaning off the Z500 with her tongue...
Thanks Doug, (and for the awesome Control Panel video that you made.)
Last night I was able to completely finish the wiring behind the TIU and AIU. (I hope its complete anyway, I'll find out if I missed something when I power up the system...). Next up, soldering to the track and making all of the wiring connections at the control panel, turnouts, and operating track.